TeleGeography: Ethernet VPLS, EoDWDM interest grows, while IP/VPN expansion dips
HISTORICAL SPACE FREQUENCIES. The first satellite to orbit the Earth was Sputnik 1, launched by the Soviets in October 1957. It carried two radio beacons on frequencies of 20.005 and 40.01 MHz. The Soviets continued to use frequencies around 20 MHz and even some around 15 MHz for many subsequent missions. This tends to be used for uplinks of the satellites that downlink in the 137 - 138 MHz band. 2  149.95 - 150.05 MHz. 3  This is used by satellites providing positioning, time and frequency services, by ionospheric research and other satellites.
1 Geosynchronous orbits (GEO) â GEO satellites, also known as geostationary satellites, move around Earth at an altitude greater than 22,223 miles (36,000 kilometers) and at the same speed of rotation. 2  As a result, satellites in these orbits are always positioned over the same spot on Earth. Satellites moving close to the Earth's surface are ideal for making observations, for military purposes and for collecting weather data. 2  Medium-Earth orbits (MEO) â These satellites park in between the low and high flyers, so from about 1,243 miles (2,000 kilometers) to 22,223 miles (36,000 kilometers).